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Cheap flights from Idaho to London from £249

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
19 Jun — 26 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to London

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 May 2026.

Tue 10/1106:20
BOI
-
LHR
1 stop21h 55m
United Airlines
Thu 12/1106:50
LHR
-
BOI
2 stops23h 16m
United Airlines
Deal found 17/5£557
Tue 10/1111:30
GEG
-
LHR
1 stop16h 30m
United Airlines
Thu 12/1106:35
LHR
-
GEG
2 stops22h 34m
United Airlines
Deal found 19/5£559
Wed 9/915:54
GEG
-
LHR
1 stop12h 41m
United Airlines
Wed 7/1008:40
LHR
-
GEG
2 stops33h 50m
United Airlines
Deal found 17/5£642
Tue 18/814:20
IDA
-
LHR
1 stop13h 35m
American Airlines
Tue 25/808:15
LHR
-
IDA
2 stops20h 05m
American Airlines
Deal found 19/5£649
Tue 8/912:53
GEG
-
LHR
1 stop17h 32m
Iberia
Tue 15/906:15
LHR
-
GEG
2 stops22h 32m
Iberia
Deal found 18/5£652
Tue 29/914:45
BOI
-
LHR
1 stop17h 50m
Delta
Wed 7/1006:30
LHR
-
BOI
2 stops19h 03m
Delta
Deal found 19/5£653
Wed 23/907:00
GEG
-
LHR
1 stop22h 05m
Delta
Wed 14/1006:30
LHR
-
GEG
2 stops17h 36m
Delta
Deal found 19/5£653
Wed 28/1013:10
IDA
-
LHR
1 stop14h 50m
KLM
Wed 4/1120:25
LHR
-
IDA
2 stops28h 49m
KLM
Deal found 20/5£653
Tue 29/914:31
BOI
-
LHR
1 stop14h 54m
United Airlines
Wed 7/1006:55
LHR
-
BOI
2 stops19h 18m
United Airlines
Deal found 19/5£653
Sun 27/912:42
BOI
-
LHR
1 stop16h 28m
Delta
Wed 30/911:45
LHR
-
BOI
2 stops17h 15m
Delta
Deal found 16/5£655
Wed 7/1010:35
IDA
-
LHR
1 stop19h 00m
United Airlines
Tue 13/1007:25
LHR
-
IDA
2 stops33h 28m
United Airlines
Deal found 19/5£657
Sat 26/917:40
GEG
-
LHR
1 stop34h 30m
Delta
Thu 8/1006:30
LHR
-
GEG
2 stops16h 15m
Delta
Deal found 19/5£657

Find flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated 20 May 2026.

Round-trip from

£557

One-way from

£249

Popular in

January

Cheapest in

April

Average price

£621
United Airlines
  • United Airlines
  • 10/11-12/11
  • 3 total stops
  • 45h 11m total
  • Idaho to London
Search Deals
KLM
  • KLM
  • 15/9
  • 1 total stop
  • 16h 25m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£139 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease (£48 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 20 May 2026.
Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 10/11

12:29-12:00

1 stop16h 31m

London Heathrow

Thu 12/11

11:05-23:06

2 stops43h 01m

£557

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 10/11

11:30-12:00

1 stop16h 30m

London Heathrow

Thu 12/11

06:35-21:09

2 stops22h 34m

£559

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Tue 18/8

14:20-10:55

1 stop13h 35m

London Heathrow

Tue 25/8

08:15-21:20

2 stops20h 05m

£649

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 23/9

06:30-15:00

1 stop24h 30m

London Heathrow

Fri 2/10

06:30-19:20

2 stops20h 50m

£654

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 5/10

15:05-15:35

1 stop16h 30m

London Heathrow

Thu 28/1

06:30-14:45

2 stops16h 15m

£655

Idaho FallsLondon

IDA - LHR

IDALHR

Idaho Falls Fanning Field

Wed 28/10

13:10-10:30

2 stops15h 20m

London Heathrow

Wed 4/11

17:50-18:14

2 stops31h 24m

£656

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sat 3/10

11:30-21:20

2 stops25h 50m

London Heathrow

Tue 27/10

06:35-23:38

2 stops24h 03m

£656

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 5/10

05:00-10:00

2 stops21h 00m

London Heathrow

Thu 28/1

06:35-23:38

2 stops25h 03m

£658

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

Tue 15/9

10:23-18:30

2 stops25h 07m

London Heathrow

Mon 28/9

19:50-18:35

3 stops29h 45m

£659

SpokaneLondon

GEG - LGW

GEGLGW

Spokane

Wed 23/9

15:05-16:00

2 stops16h 55m

London Gatwick

Fri 9/10

10:25-21:05

2 stops18h 40m

£661

Flights are sorted by cheapest return flights first.

Deals found on 15/5

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to London

What is the cheapest month to book a flight from Idaho to London?

Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of £298). Flying from Idaho to London in May is currently the most expensive (average of £512). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Idaho to London?

Related info for your journey

Find useful and relevant information for your journey from Idaho to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho to London?

    A quick flight from Idaho to London can take about 13h 35m. United Airlines provides one of the quickest options available for as low as £649. The distance from Idaho to London is about 4705 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Idaho to London?

    While some choose either Spokane - London Heathrow or Boise Air Term. Gowen Fld - London Gatwick, Boise Air Term. Gowen Fld - London Heathrow is the most popular route from Idaho to London.

  • Can I find deals for flights from Idaho to London that include hotel bookings?

    Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Idaho to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.

  • Can I find deals for business class flights from Idaho to London?

    Yes. Cheapflights offers flight deals from Idaho to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to London?

    Currently, October is the cheapest month in which you can book a flight from Idaho to London (average of £298). Flying from Idaho to London in May is currently the most expensive (average of £512). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Milton Keynes
Hounslow
Croydon
Wembley
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Ipswich
Southend-on-Sea
Guildford
Southall
Chelmsford

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Fly with Cheapflights

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How does Cheapflights help users find flights from Idaho to London?

When you search for this flight from Idaho to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Idaho to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Idaho to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Idaho to London with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Idaho to London flexibly with Cheapflights today.

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Of course! You can now track prices for flights from Idaho to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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